I grew up in the area so spent a lot of time in the arcades on the sea front and around Butlins. Whoever used to run the Olympia arcade (was "Electric wonderland" last time I was down) obviously had a thing for pinball, as they had both a TAF and IJ NIB.
As legend has it, they went to decommission the indoor pool (the one that's near Jumping Jacks) but found out it was used as a reservoir for the fire sprinkler system, so apparently it's still there but just blocked off access to the public.
Bognor Butlins had one of those, you could see some quite unpleasant things going onWas that the one that had a viewing window in a restaurant/ bar?